PART 8: MAINTENANCE AND SERVICE
Brake Adjustment
CAUTION: The air brake system of this vehicle
was con
fi
gured for ONE of the following opera-
tions: tractor or truck, and complies with the re-
spective portions of FMVSS 121. A tractor shall
not be operated or con
fi
gured as a truck, nor
shall a truck be operated or con
fi
gured as a trac-
tor, without signi
fi
cant modi
fi
cations to the air
brake system in order to retain compliance with
FMVSS 121. Contact your Peterbilt dealer for in-
structions.
Once a brake system is set to speci
fi
cations, changing any
one of its components or any combination of components
may cause the system to not work as well. All parts have to
work together to perform as they should. Any replacement
components in your brake system should be exactly equal
to the original components. Any changes from the original
speci
fi
cations can affect the whole system. All of the fol-
lowing areas are interrelated and must conform to original
speci
fi
cations:
• Tire Size
• Drum brakes
A. Cam Radius
B. Wedge Angle
C. Drum Radius
D. Brake Linings
E. Brake Chambers
F. Slack Adjusters
WARNING! A nonconforming part in your brake
system could cause an accident. Sizes and
types are so related to one another that a seem-
ingly unimportant change in one may result in a
change in how well your brakes work for you on
the road. If parts don’t work together properly,
you could lose control of your vehicle. Be sure
any replacement parts in your brake system
conform exactly to original speci
fi
cations.
All vehicle operators should check their brakes regularly.
Always adjust your brakes when they are cool.
WARNING! Brake linings and pads with a thick-
ness below the speci
fi
ed minimum will have ex-
posed rivets. Use of such linings can damage
the braking surface and also reduce brake ef
fi
-
ciency, which could cause an accident or sys-
tem failure.
R(08/07)
Y53-6015
– 147 –
Summary of Contents for Peterbilt 320
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Page 210: ...PART 11 SUBJECT INDEX Windshield Washer Reservoir 29 206 Y53 6015 R 08 07 ...
Page 212: ...Peterbilt Motors Company P O Box 90208 Denton Texas 76202 ...